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diff --git a/lib/pleroma/captcha/service.ex b/lib/pleroma/captcha/service.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Captcha.Service do
+  @doc """
+  Request new captcha from a captcha service.
+
+  Returns:
+
+  Type/Name of the service, the token to identify the captcha,
+  the data of the answer and service-specific data to use the newly created captcha
+  """
+  @callback new() :: %{
+              type: atom(),
+              token: String.t(),
+              answer_data: any()
+            }
+
+  @doc """
+  Validated the provided captcha solution.
+
+  Arguments:
+  * `token` the captcha is associated with
+  * `captcha` solution of the captcha to validate
+  * `answer_data` is the data needed to validate the answer (presumably encrypted)
+
+  Returns:
+
+  `true` if captcha is valid, `false` if not
+  """
+  @callback validate(
+              token :: String.t(),
+              captcha :: String.t(),
+              answer_data :: any()
+            ) :: :ok | {:error, String.t()}
+end